Ripping attachment for sewing-machines



a No. 622,672. Patented Apr. II, I899.

G. A. EMEHY & W. J. CUNNINGHAM. RIPPING ATTACHMENT FOR SEWING MACHINES.

(Application filed June 1, 1898. (No Model.)

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UNItnn STATES GLEN A. EMERY AND \VILLIAM J.

PATENT Drrrcn.

CUNNINGHAM, on TOLEDO, OHIO.

RIPPING ATTACHMENT FOR SEWING-"MACHINES.

SPECIFICATION forming part of Letters Patent No. 622,672, dated April11, 1899.

Application filed June 1, 1898. Serial No. 682,309. (No model.)

T0 at whom, it may concern/.

Be it known that we, GLEN A. EMERY and WILLIAM J. CUNNINGHAM, citizensof the United States, residing at Toledo, in the county of Lucas andState of Ohio, have invented a new and useful Ripping Attachment forSewing-Machines, of Which the following is a specification.

Our invention relates to ripping attachments for sewing-machines, andhas for its object to generally improve, cheapen, and simplify theconstruction and increase the utility of such devices.

"With this object in view our invention consists in the improvedconstruction, arrangement, and combination of parts hereinafter fullydescribed and afterward specifically pointed out in the appended claim.

In order to enable others skilled in the art to which our invention mostnearly appertains to make and use the same, we will now proceed todescribe its construction and operation, reference being had to theaccompanying drawings, forming part of this specification, in which- IFigure 1 is a perspective view of so much of a sewing-machine as isnecessary to illustrate our invention having our improved rippingattachment applied thereto. Fig. 2 is a horizontal longitudinal sectionthrough our improved ripping attachment on the line 2 2 of Fig. 3,detached from the machine. Fig. 3 is a longitudinal section on the line3 3 of Fig. 2. Fig. 4 is a face view of the ripping knife or cutter.Fig. 5 is a cross section through the same. Fig. 6 is a detail sectionalview on the line 6 6 of Figs. 2 and 3, looking in the direction of thearrow.

Like letters of reference mark the same parts wherever they occur in thedifferent figures of the drawings.

Referring to the drawings by letters, A in dicates the frame of asewing-machine, and B the driving-belt thereof, a bracket A beingsecured to the front of the frame A and our improved ripping attachmentbeing pivotally secured to said bracket, the attachment being providedwith lugs O G to embrace the outer end of the bracket and a horizontalscrew G to pass through the lugs and the end of the bracket beingthreaded into one of the lugs in order to securely clamp the attachmentin position.

The main body of the attachment consists of two parts D and E, one ofthe lugs C being attached to the part E and the other to the part D, thepart D being also provided with a laterally-projectin g hollow stem F.In the stem F is journaled a shaft G, provided on its outer end with agroove-pulley G, adapted to engage the belt B, and on its inner end, ina recess formed between the two parts D and E, with a crown-wheel H, theteeth of which engage a pinion I on a shaft J, which extends through anopening in the part D and is provided at its outer end with a pinion K,which meshes with the teeth of a crown-wheel L, formed on one face of aripping-cutter M, which is journaled on a screw N in a space left forits accommodation between the outer ends D and E of the parts D and E.This cutter stands vertically, .and its casing is cut away for aboutone-third of a circle, as at N, to expose the edge of the cutter.

The construction of our invention will be readily understood from theforegoing description, and its operation may be described as follows:The parts being in the position as shown, with the groove-pulley G Incontact with the belt 13, the pulley will be thereby rotated, carryingwith it the shaft G and crownwheel H, which in its turn will rotate thepinion I, shaft J, and pinion K, and by the engagement of the pinion Kwith the crownwheel L, formed on the cutter, will be rapidly rotated,the speed of the cutter being much more rapid than that of the pulley Gon account of the difference in diameter of the crown-wheel H and pinionI, this speed being, however, somewhat reduced on account of thecrown-wheel L being of a greater diameter than the pinion K. The speed,however, may

be regulated by changing the size or number WVhile We have illustratedand described what we now consider to be efficient means for carryingout our invention, We do not wish to be understood as limiting ourselvesto the exact details of construction shown and described, but hold thatsuch slight changes or variations as might suggest themselves to theordinary mechanic would properly fall Within thelimit and scope of ourinvention.

Having thus fully described our invention, what we claim as new, anddesire to secure by Letters Patent of the United States, is

In a ripping attachment for sewing-machines, the combination of theparts D and E, provided at their inner ends with pivotal lugs and attheir outer ends with a recess to receive a cutter, the part D beingalso provided with a laterally-projecting tube or bearing F, the shaft Gjournaled in said bearing and provided on its outer end with agroovepulley and at its inner end with a crown- Wheel, the shaft Jjournaled in an opening extending longitudinally through the part D, apinion on its inner end meshing with the crown-wheel H, a pinion on itsouter end, a cutter journaled in the recess between the parts D and E,and a crown-wheel formed on one side thereof, meshing with the pinion K,substantially as described.

GLEN A. EMERY WILLIAM J. OUNN IN GHAM.

Witnesses:

M. C. FOGARTY, J 'AMES R. CUNNINGHAM.

